Assionob to the simplex piston



D. M. SOLENBERfiER April 12, 1932.

PISTON RING Original Filed Sept. 26, 1927 a M m, V 2 :l a z a v /////A M/ /%m///// 4 .I 7/ f 0 w E w 6 K a, 2% J $7 3 Reissued Apr. 12,

I UNITEos-TATES' PATENT l oFFicE Y DEAN m. sonmnnena, or CLEVELAND, 0310, AssIeNon' T0.'1HE sImrLEx rrs'ron RING COMPANY or AMERICA,' 1110,, A CORPOR TION or OHIO a r Isr'oN nine 7 Original No. 1,748,578, dated January 14,1930, SeriziLNo. 222,091,-fi1ed September 26, 1927; Application for reissue filed october 31, 1930. Serial No. 492,608.

The invention relates to piston rings and more particularly to rings designed for use in oil drainin grooves to control the thickness of the In ricating film onthe cylinder wall.

In the present state of the art rings for this purpose have been arranged in the lower ring groove of the piston which latter is provided withdrain apertures for the escape of 011 10 collecting therein. The rings are also slotted or perforated to provide passages for the 011 from the cylinder wall into the groove. Another type .of ring which has beer? extensively used is one which is circumferentially slotted to impart axial resiliency thereto so as to maintain a seal with-thewalls of the ring groove. Rings of this latter type are usually reduced in depth to provide greater flexibility for conforming to a non-circular cylinder, and to impart the required radial expansion a 'corrugatedribbo'n expander is placed between the ring'and-the bottom of the ring groove.

i It is the object of the present invention to obtain a construction of ring particularly adapted or use in the bottom drained oilgrooveol the piston which also has the advantages resulting from the use of a radially thin mug and aborrugated ribbon expander.

,; Inasmuch, however, as the expander is. usu;

ally of substantially the same width as the groove, it would form an obstruction to the passa e of the oil to the drainand would there orQnterfer-e with the proper functionin of the ring. I have overcome this diificurty by the construction as hereinafter set fo I In the drawings:

a piston shown as having three grooves with my improved construction of ring in the lower groove.

Figure 2 is a sectional perspective view of a ortion of the ring igur'es 3 and 4 are cross sections through rin being provided with the drain apertures C passing through the wall of the piston. D is a plain ring in the ringgroove B and E is a circumferentially slotted-axially resilient ring in the groove B with a corrugated ribbon expander F for radially expanding the 1 same.

. 'My improved construction of ring G as shown in Figure lis also circumferentially slotted for axial resiliency andis reduced in 80 v inwardly extending flange K on its lower portion. -The-flange K performs the additional function of increasing the hearing or land surface of the ring on the bottom wall of the ring grooves and this is important as it is customary with drained ring grooves [5 to relieve the piston -.on the under side of the groove so as to give greater clearance for the oil. Thus the ring as constructed has the advantages first of sealingwith the walls of thering groove second, flexibility permitting it to conform to a non-circular cylinder;

third, it is moved radially outward by the distributed pressure of the corrugated .ribbon expander; fourth, this expander is held up above the bottom of the groove for the 8 passage of oil therebeneath; fifth, the circumferential slots in'the ring permit, of passage of oil from the cylinder wall'inward Figure 1 isa section through a portion of the ports C; sixth, the pressure of the (ax-'9 into the groove from which it drains through pander being directly applied to the upper portion of the ring this portion will squeeze theJoil filmon the cylinderwall thinner; seventh,the area of peripheral contacts is reduced by the slots so that the radial pressure on the ring is more 'elfective in thinning oil fihn on the cylinder. q

.While 1' preferably use the constructionshown ;in :Figure 1' certain'features of my improvement are also applicable to rings which are not axially expansible. Thus, as shownin Figure 3 a ring L is formedwith the radially narrow upper portion L and the in;

wardly extending flange'L on its lower portion for holding up the expander H and for increasing the land surface on the ring groove. This ring may be provided with any suitable means such as a single row of slots L for permitting oil to pass into the ring groove at various points.

In Figure 4 a ring M central radially thin portion M .andflanges M M at the upper and lower ends thereof. Slots M are provided through the central portion and the expander is held in-central positionby the flanges M and M What I claim as my invention is:

1. The-combination with a member having a ring groove therein, ot-a ring in said groove circumferentially slotted for axial resiliency whereby the sides of the ring are held in sealing contact with the sides of the ring groove,'said ring having a portion of its width reduced in radial depth to impart circumferential flexibility and provided in its lower portion with an inwardly extending flange increasing the land contact on the ring 3. The

roove and a corrugated ribbon expander of a width less than the. ring groove, said expander being arranged in contact with the thin portion of the ring and held irom dislacement therein by said flange. V

2. The combination with a member having is shown having a lip or ring groove prior to contraction of the ring in said groove for insertion in said cylinder.

5. The combination with a member having a ring groove therein, of a ring in said groove provided with a radially inwardly extending lip or flange on one side thereof increasing the width of landing surface upon the corresponding side of the ring groove, and a corrugated ribbon expander of lesserwidt-h th 11 the ring having one of its side edges bearln against the shoulder formed by said the opposite side ofthe ring groove to hol the ring in substantial registration with sai groove.

6. The comb'matlon with a member having a ring groove therein, of a ring in said groove having a portion restricted in radial depth to impart circumferential flexibility thereto,

a ring groove therein, and drain apertures for said groove, of a ring of normal width greater than the groove circumferentially' I slotted for axial resiliency whereby it is held 111; sealing contact with the walls of the groove, one portion of said ring being re-' duced in radial-depth to increase the flexibility thereof and another portion being provided with an inwardly extending flange and a corrugated ribbon -Iexpander within the groove bearing'upon the thin portion of the if-ling and heldv from displacement by said ange.

combination with a member proand an integral radially. inwardly extending lip 'or flange adjacent to said portion to increasethe landing surface on the side of the ring groove, and a corrugated expander of a. width less than the ring'bearing against the thin portion thereof with one-edge adjacent to said inwardly extending lip or flange.

' In testimony whereof I afllx my signature.

DEAN M. SOLENBERGER.

flange, and the opposite edge engaging vided with a ring groove, of a ring in said groove having a portion restricted in radial depth and a plurality of inwardly extending flanges on opposite sides of said portion, and a corrugated ribbonexpander within the groove and of a width less than the groove -to lie between said inwardly extending flanges.

4. The combination with a. cylinder and a 1 piston having a-ring groove" therein, of a ring in said groove having a radially inwardly extending lip or flange on one side there- 'of, a corrugated ribbon expander of lesser width than the ring arranged between the same and thebottom of the ring groove and having one edge portion contacting with the shoulder formed by said lip or flange to hold said ring in substantial registration with the 

